240021321 has 4 divisors (see below), whose sum is σ = 320028432. Its totient is φ = 160014212.

The previous prime is 240021293. The next prime is 240021323. The reversal of 240021321 is 123120042.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 240021321 - 2⁵ = 240021289 is a prime.

It is a super-2 number, since 2×240021321² = 115220469069170082, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 240021321.

It is not an unprimeable number, because it can be changed into a prime (240021323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40003551 + ... + 40003556.

It is an arithmetic number, because the mean of its divisors is an integer number (80007108).

Almost surely, 2^240021321 is an apocalyptic number.

It is an amenable number.

240021321 is a deficient number, since it is larger than the sum of its proper divisors (80007111).

240021321 is an equidigital number, since it uses as much as digits as its factorization.

240021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80007110.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 240021321 is about 15492.6215018634. The cubic root of 240021321 is about 621.4649032304.

Adding to 240021321 its reverse (123120042), we get a palindrome (363141363).

The spelling of 240021321 in words is "two hundred forty million, twenty-one thousand, three hundred twenty-one".